Compilare: user.cpp: In function ‘void Solve()’: user.cpp:85:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (g[i].size() == n - 1)start = i; ^ user.cpp: In function ‘void Read()’: user.cpp:39:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] { scanf("%d%d", &n, &m), Reset (); ^ user.cpp:42:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] { scanf("%d%d", &x, &y); ^ user.cpp: In function ‘int main()’: user.cpp:110:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] { freopen("divisorgraph.in", "r", stdin); ^ user.cpp:111:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divisorgraph.out", "w", stdout); ^ user.cpp:114:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^